Using Mg II Doublet to Predict the Lyman Continuum Escape Fraction from 14 HETDEX Galaxies

Victoria Salazar; Floriane Leclercq; John Chisholm; Gary J. Hill; Gregory R. Zeimann

Using Mg II Doublet to Predict the Lyman Continuum Escape Fraction from 14 HETDEX Galaxies

Astrophysics of Galaxies 2023-12-12 v2

Authors: Victoria Salazar , Floriane Leclercq , John Chisholm , Gary J. Hill , Gregory R. Zeimann

Abstract

Indirect diagnostics of Lyman continuum (LyC) escape are needed to constrain which sources reionized the universe. We used Mg II to predict the LyC escape fraction (fesc(LyC)) in 14 galaxies selected from the Hobby-Eberly Telescope Dark Energy Experiment solely based upon their Mg II properties. Using the Low Resolution Spectrograph on HET, we identified 7 and 5 possible LyC leakers depending on the method, with fesc(LyC) ranging from 3 to 80%. Interestingly, our targets display diverse [O III]/[O II] ratios (O32), with strong inferred LyC candidates showing lower O32 values than previous confirmed LyC leaker samples. Additionally, a correlation between dust and fesc(LyC) was identified. Upcoming Hubble Space Telescope/Cosmic Origins Spectrograph LyC observations of our sample will test if Mg II and dust are predictors of fesc(LyC), providing insights for future JWST studies of high-redshift galaxies.

Keywords

lyman continuum escape mg ii doublet galaxy reionization hetdex o32 ratio dust correlation high-redshift galaxies

Cite

@article{arxiv.2311.18008,
  title  = {Using Mg II Doublet to Predict the Lyman Continuum Escape Fraction from 14 HETDEX Galaxies},
  author = {Victoria Salazar and Floriane Leclercq and John Chisholm and Gary J. Hill and Gregory R. Zeimann},
  journal= {arXiv preprint arXiv:2311.18008},
  year   = {2023}
}

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4 pages, 1 figure. Accepted to RNAAS

Using Mg II Doublet to Predict the Lyman Continuum Escape Fraction from 14 HETDEX Galaxies

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